Quick-release connector

ABSTRACT

A quick-release connecting apparatus for detachably interconnecting two objects includes male and female structures respectively attachable to the objects. The female structure has a generally U-shaped receptacle formed therein which opens at a peripheral edge thereof, the male structure has a stud projecting therefrom with a part-circular head at its distal end with a straight side which is dimensioned to be received in the receptacle from its open end and being rotatable about the axis of the stud while disposed in the receptacle. A retaining prong is unitary with the female structure and is flexibly and resiliently movable between a locking position projecting into the entrance of the receptacle and a release position out of the entrance. The stud head moves the retaining member out of the way upon insertion into the receptacle to permit insertion in any orientation, but the retaining prong prevents removal of the head from the receptacle except when it is in a single orientation wherein the straight side faces the pawl. A flexible, resilient bias finger integral with the female structure projects into the receptacle for resilient engagement with the head to inhibit rotation thereof while in the receptacle.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation-in-part of U.S. application Ser. No. 925,862 filed Aug. 7, 1982, now U.S. Pat. No. 5,201,858.

Background of the Invention

1. Field of the Invention

The present invention relates to connecting or fastening devices and particularly to a connecting apparatus that permits two objects to be quickly and detachably interconnected.

2. Description of the Prior Art

A number of connecting apparatuses have heretofore been provided which include male and female members engageable with each other. One such connecting apparatus for mounting an object on a belt is disclosed in my U.S. Pat. No. 5,054,170. In that apparatus, the female member defines a receptacle, and the male member has an irregularly shaped head or button which is slid into the receptacle through an open-top slot past a deflectable detent which projects into the entry end of the slot. Once the button has entered the receptacle, the detent prevents its removal except in one orientation of the button. In practice, the detent has a tendency to wear so that, eventually, it does not serve to trap the button in the receptacle.

In order to alleviate this difficulty there is disclosed in my co-pending U.S. application Ser. No. 925,862, filed Aug. 1, 1992, a similar connecting apparatus wherein the deflectable detent is replaced by a pawl which moves into and out of the path of the head through the slot. The pawl is biased to a slot-blocking position, and the head of the male member can move the pawl out of the way to a release position against the bias on entering the receptacle, but is blocked by the pawl from exiting the receptacle except in one orientation of the head. It has been found that it is possible that when the head is rotated in the receptacle while in engagement with the pawl, it can tend to move the pawl to its release position even if the head is not in its predetermined removal orientation. Furthermore, the head is freely rotatable in the receptacle, which may permit undesirable rotational movements of the interconnected objects relative to each other. Also, this construction includes discrete pawl and bias means which complicates assembly and adds to the cost thereof.

SUMMARY OF THE INVENTION

It is a general object of the present invention to provide an improved apparatus for detachably interconnecting two objects, which avoids the disadvantages of prior apparatuses while affording additional structural and operating advantages.

An important feature of the invention is the provision of an apparatus of the type set forth which effectively prevents accidental disengagement of the apparatus.

Still another feature of the invention is the provision of an apparatus of the type set forth which minimizes the number of parts.

A further feature of the invention is the provision of an apparatus the type set forth which inhibits pivoting movements of the objects relative to each other while interconnected.

These and other features of the invention are attained by providing apparatus for detachably interconnecting two objects including, in combination: a female structure adapted to be secured to one of the objects and defining a receptacle and an entrance leading into the receptacle, a male structure adapted to be secured to the other object and including a shank with an axis and an enlarged head on the shank adapted for movement into and out of the receptacle through the entrance and rotatable about the axis while in the receptacle, and a flexible resilient retaining member integral with the female structure and normally disposed in a locking position projecting into the entrance for interference with passage of the head therethrough, the retaining member being yieldably movable to a release position accommodating passage of the head through the entrance, the head being non-symmetrical with respect to the axis so that while passing through the entrance in one rotational orientation thereof the head will clear the retaining member in its locking position and in all other rotational orientations it will engage the retaining member in its locking position, the retaining member being yieldably movable to its release position in response to engagement by the head during passage thereof into the receptacle and being non-yieldably engageable by the head in the receptacle to prevent removal thereof from the receptacle in all but the one rotational orientation.

The invention consists of certain novel features and a combination of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the details may be made without departing from the spirit, or sacrificing any of the advantages of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

For the purpose of facilitating an understanding of the invention, there is illustrated in the accompanying drawings a preferred embodiment thereof, from an inspection of which, when considered in connection with the following description, the invention, its construction and operation, and many of its advantages should be readily understood and appreciated.

FIG. 1 is a fragmentary perspective view illustrating the mounting of an object on a belt-mountable loop by means of the connecting apparatus of a first embodiment of the present invention;

FIG. 2 is an enlarged, fragmentary, sectional view taken along the line 2--2 in FIG. 1, with portions broken away more clearly to illustrate the construction;

FIG. 3 is a reduced view similar to FIG. 2, but with the two objects disconnected, and with the object carrying the male connector shown in phantom in various orientations;

FIG. 4 is a rear elevational view of the assembly of FIG. 1;

FIG. 5 is a view similar to FIG. 4, but with the object rotated 180° to permit disconnection;

FIG. 6 is an enlarged, perspective, exploded view of the connecting apparatus of FIG. 1;

FIG. 7 is a view similar to FIG. 6, of a connecting apparatus in accordance with another embodiment of the invention;

FIG. 8 is an enlarged front elevational view of the assembled connecting apparatus of FIG. 7, with the cover plate removed and illustrated in phantom, showing the male member being inserted into the entrance of the receptacle in the female member;

FIG. 9 is a view similar to FIG. 8, illustrating movement of the pawl in response to further passage of the male member into the receptacle;

FIG. 10 is a view similar to FIG. 9, illustrating seating of the male member in the receptacle;

FIG. 11 is a view similar to FIG. 10, illustrating removal of the male member from the receptacle;

FIG. 12 is a fragmentary perspective view illustrating two objects disposed for interconnection utilizing the apparatus in accordance with another embodiment the present invention;

FIG. 13 is a view similar to FIG. 12, illustrating the objects in their interconnected condition;

FIG. 14 is an enlarged, fragmentary, front elevational view of the female structure of the connecting apparatus of FIG. 12;

FIG. 15 is an enlarged, fragmentary, front elevational view of the male structure of the connecting apparatus of FIG. 12;

FIG. 16 is a fragmentary view in vertical section taken along the line 16--16 in FIG. 14;

FIG. 17 is a view similar to FIG. 14, with portions of the female structure broken away and illustrating the male structure head in the receptacle of the female structure, with the head disposed in an orientation for retention in the receptacle;

FIG. 18 is a fragmentary view in vertical section taken along the line 18--18 in FIG. 17;

FIG. 19 is a view similar to FIG. 17, with the male structure head illustrated in its removal orientation; and

FIG. 20 is a fragmentary sectional view taken along the line 20--20 in FIG. 19.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, there is illustrated a device 20, which may be in the nature of a radio pager or the like, having a rear wall 21 and adapted to be mounted on a belt 25 by means of a hanger loop 26 which has a pair of legs 27 or 28 interconnected by a bight 29 and connectable at the ends thereof opposite the bight 29 by suitable snaps or the like. If desired, a stiffening plate (not shown) may be secured to the inner surface of the leg 27. The device 20 is detachably mountable on the hanger loop 16 by means of the connecting apparatus 30 of the present invention.

Referring also to FIGS. 2-6, the connecting apparatus 30 includes a female member 31 and a male member 60 which are mountable, respectively, on the leg 28 of the hanger loop 26 and the rear wall 21 of the device 20, for cooperate on to mount the device 20 on the hanger loop 26. The female member 31 may be of multi-part construction, including a flat, generally rectangular base plate 32 having four holes 33 formed therethrough, respectively adjacent to the corners thereof. A pin 34 is fixed to the base plate 32 and projects forwardly a slight distance therefrom. The connecting apparatus 30 also includes a cover plate 35 which is also provided with holes 36 therethrough, respectively adjacent to the corners thereof. The cover plate 35 has an elongated slot 37 formed therein from an upper peripheral edge thereof, the slot 37 terminating at a generally U-shaped inner end 38 and having chamfered entrance surfaces 39.

The female member 31 also includes a generally rectangular center plate 40 provided with holes 41 therethrough, respectively adjacent to three of the corners thereof. The center plate 40 has an irregular aperture 42 formed therein from an upper peripheral edge thereof, terminating in an arcuate inner end 43, and having an irregular cutaway portion 44 which removes the fourth corner of the center plate 40. The cutaway portion 44 includes a narrow slot 45 adjacent to the arcuate end 43.

In assembly, the center plate 40 is disposed between the base plate 32 and the cover plate 35, the three plates being stacked in congruent relationship so that the holes 41 are respectively aligned with the holes 33 and 36 for respectively receiving rivets 46 to secure the parts of the female member 31 together. When thus assembled, the slot 37 is aligned with the aperture 42, with the U-shaped end 38 substantially concentric with the arcuate end 43. However, the slot 37 and the U-shaped end 38 are, respectively, smaller than the aperture 42 and the arcuate end 43, so that the peripheral edges of the former extend inwardly beyond the edges of the latter for cooperation therewith and the base plate 32 to define a generally U-shaped receptacle 47 (FIG. 2) having an elongated entrance 48 which opens at the top edge of the female member 31. It will be appreciated that the rivets 46 may also serve to secure the female member 31 to the inner leg 28 of the hanger loop 26.

The female member 31 also includes an elongated pawl 50 having a circular hole 51 therethrough adjacent to one end thereof and provided with a generally semicircular notch 52 therein along the upper edge thereof, the lower edge thereof defining a bearing surface 53. The apertured end of the pawl 50 is disposed at the cutaway corner of the cutaway portion 44 of the center plate 40, between the base plate 32 and the cover plate 35, being pivotally movable about the adjacent one of the rivets 46, which passes through the hole 51. More specifically, the pawl 50 is pivotally movable between a locking position, illustrated in FIGS. 2, 4 and 5, disposed against the pin 34 so that the pin 34 rests in the notch 52, and a release position, illustrated in FIG. 3, pivoted clockwise away from the pin 34 into the lower end of the cutaway portion 44. A leaf spring 55 has one end thereof fixedly seated in the slot 45 and has the other end thereof resiliently bearing against the bearing surface 53 of the pawl 50, resiliently to urge it to its locking position. As can best be seen in FIG. 2, in its locking position the pawl projects a predetermined distance into the entrance 48 of the receptacle 47, whereas in its release position it is disposed out of the entrance 48.

The male member 60 includes a rectangular plate 61 (FIGS. 1 and 6), which may be substantially congruent with the female member 31, and which may be secured by rivets or other suitable fasteners (not shown) to the rear wall 21 of the device 20. The central portion of the plate 61 may be raised to defined a rectangular channel which extends between the top and bottom edges of the plate 61 substantially parallel to the side edges thereof, in the manner illustrated in the aforementioned U.S. Pat. No. 5,054,170. A stud 65 is fixed to the plate 61 centrally thereof and projects rearwardly therefrom. The stud 65 may include a cylindrical shank 66 provided at its distal end with an enlarged, disk-like, part-circular head 67 which is coaxial with the shank 66 and is truncated along a chord thereof to define a straight side edge 68.

Referring now in particular to FIGS. 2-5, the operation of the connecting apparatus 30 will be described. It will be appreciated that the female member 31 is mounted on the hanger loop 26 so that, in use, the receptacle 47 will open upwardly when the hanger loop 26 is mounted on the belt 25 of a user. Thus, the female member 31 defines an open-top or top-loading receptacle 47. In use, the device 20 is positioned with the male member 60 facing the female member 31 and substantially parallel thereto, as indicated in FIG. 3. The head 67 of the stud 65 is then inserted into the open entrance 48 of the receptacle 47 and slid downwardly in the direction of the arrow in FIG. 3, with the shank 66 extending through the slot 37 in the cover plate 35.

The head 67 has a diameter substantially greater than the width of the slot 37 in the cover plate 35 and slightly less than the width of the receptacle 47, which is defined by the diameter of the arcuate end 43 of the center plate aperture 42. The straight side edge 68 of the head 67 is so dimensioned and positioned that, when it is disposed facing the pawl 50, the head 67 will clear the pawl 50 in its locking position as the head 67 moves into the receptacle 47. In any other rotational orientation of the device 20 about the axis of the stud shank 66, the pawl 50 in its normal locking position will interfere with the passage of the head 67 into the receptacle 47. However, the leaf spring 55 permits the pawl 50 to be cammed to its release position by the head 67 to permit passage of the head 67 into the receptacle 47. Accordingly, it is a significant aspect of the invention, that the male member 60 may be engaged with the female member 31 in any rotational orientation of the device 20, as indicated in FIG. 3.

Once the head 67 is seated in the inner end of the receptacle 47, the pawl 50 will spring back to its locking position, under the urging of the leaf spring 55, as indicated in FIG. 2. Thus, the head 67 is trapped in the receptacle 47, since it is too large to pass through the slot 37 in the cover plate 35. The head 67 is then freely rotatable in the receptacle 47 to bring the device 20 to its normal use orientation, illustrated in FIG. 4, which is preferably with the straight side edge 68 of the head 67 facing away from the pawl 50. It can be seen that, in this orientation, the pawl 50 prevents removal of the head 67 from the receptacle 47. Indeed, removal is prevented in any rotational orientation of the device 20 except the one wherein the straight side edge 68 of the head 67 faces the pawl 50, as illustrated in FIG. 5. In this single orientation, the pawl 50 will not interfere with passage of the head 67 from the receptacle 47 so that the male member 60 can be disconnected from the female member 31 by moving it in the direction of the arrow of FIG. 5.

Referring now to FIGS. 7-11, there is illustrated an alternative form of connecting apparatus, generally designated by the numeral 70, in accordance with another embodiment of the invention. The connecting apparatus 70 includes the same male member 60 as was used with the connecting apparatus 30, and includes a female member 71 which is similar to the female member 31, differing primarily in the formation of the center plate and the pawl. More specifically, the female member 71 includes a base plate 72 which is substantially identical to the base plate 32, except that it does not include the pin 34. The female member 70 also includes a rectangular cover plate 75 which is virtually identical to the cover plate 35, having an elongated slot 77 formed in an upper edge thereof and terminating in a U-shaped end 78.

The female member 71 includes a center plate 80 which has four holes 81 therethrough adjacent to the corners thereof and an aperture 82 formed in an upper edge thereof and terminating at an arcuate inner end 83. To one side of the arcuate end 83, the aperture 82 defines a rectangular notch 84 having a small rectangular recess 85 at its inner end. Projecting laterally from the notch 84 adjacent to its outer end and extending substantially perpendicular thereto is another rectangular notch 86 defining lower and upper stop surfaces 86a and 86b.

In assembly, the plates 72, 75 and 80 are secured together by rivets 46 in the same manner as was described above in connection with the connecting apparatus 30. The aperture 82 cooperates with the base plate 72 and the cover plate 75 to define a receptacle 87 having an elongated entrance 88 having chamfered upper end surfaces 89.

Disposed in the aperture 82 is a pawl 90 which has a rectangular leg 91 disposable in the notch 84 and provided at its distal end with a short rectangular recess 92. A helical compression spring 93 has one end thereof seated in the recess 85 and the other end thereof seated in the pawl recess 92 for resiliently urging the pawl 90 outwardly of the notch 84. The pawl 90 also has a leg 95 which projects laterally from the leg 91 substantially perpendicular thereto for disposition in the notch 86, but having a width substantially less than that of the notch 86. The leg 95 has opposed lower and upper side surfaces 96 and 97, respectively disposed for engagement with the stop surfaces 86a and 86b. The pawl 90 includes an arcuate surface 98 disposed opposite the inner corner between the legs 91 and 95.

In use, the pawl 90 is adapted for reciprocating sliding movement in the aperture 82 in directions oblique to the direction of the receptacle entrance 88. Specifically, the pawl 90 moves between a locking position, illustrated in FIGS. 8, 10 and 11, wherein the side surface 97 is resiliently urged by the spring 93 against the stop surface 86b, and wherein the pawl 90 projects a predetermined distance into the entrance 88 of the receptacle 87, and a release position, illustrated in FIG. 9, disposed out of the entrance 88. Movement of the pawl 90 in the direction of its release position is limited by engagement of the side surface 96 with the stop surface 86a.

The operation of the connecting apparatus 70 is substantially the same as that of the connecting apparatus 30. More specifically, the head 67 of the male member 60 may be inserted, in any rotational orientation thereof, into the receptacle 87, by engaging the pawl 90 and camming it to its release position, against the urging of the spring 93, as indicated in FIG. 9. Once the head 67 is disposed in the receptacle 87, the pawl 90 springs back to its locking position wherein it cooperates with the base plate 72 and the cover plate 75 to trap the head 67 in the receptacle 87 in all rotational orientations except that in which the straight side edge 68 of the head 67 is disposed facing the pawl 90 as illustrated in FIG. 11. In that one rotational orientation of the male member 60, the head 67 will clear the pawl 90 in its locking position so as to permit disconnection of the male member 60 from the female member 31.

In a constructional model of the invention, the male member 60 and the female members 31 and 71 are formed of metal, but it will be appreciated that they could be formed of other suitable materials. Also, while the female members 31 and 71 are illustrated as being of multi-part construction, other constructions would be possible to achieve the same results.

Referring to FIGS. 12 and 13, there is illustrated a device 110, which may be in the nature of a radio pager or the like, having a rear wall 111 and adapted to be mounted on a belt 115 by means of a hanger loop 116 which has a pair of legs 117 and 118 interconnected by a bight 119 and connectable at the ends thereof opposite the bight 119 by suitable snaps or the like. If desired, a stiffening plate 114 may be secured to the inner surface of the leg 118. The device 110 is detachably mountable on the hanger loop 116 by means of connecting apparatus 120 in accordance with the present invention.

Referring also to FIGS. 14-20, the connecting apparatus 120 includes a female structure 121 and a male structure 150 which are, respectively, mountable on the leg 118 of the hanger loop 116 and the rear wall 111 of the device 110, for cooperation to mount the device 110 on the hanger loop 116. The female structure 121 may be of multi-part construction, including a flat, generally rectangular base plate 122, having four holes (not shown) formed therethrough respectively adjacent to the corners thereof. The plate 122 has an irregular aperture 123 formed therein which defines a cutout retaining prong 124 and a significantly larger cutout bias finger 125 disposed laterally alongside the retaining prong 124 and spaced a slight distance therefrom. Both the retaining prong 124 and the bias finger 125 are bent forwardly out of the plane of the base plate 122, the bias finger 125 having an inclined portion 126 which is connected to the base plate 122 and inclined with respect to the plane thereof, and a distal end portion 127 which is generally parallel to the plane of the base plate 122.

The connecting apparatus 120 also includes a cover plate 130 which is also provided with corner holes (not shown) therethrough. The cover plate 130 has an elongated slot 132 formed therein from an upper peripheral edge thereof, the slot 132 terminating at a generally U-shaped inner end 133 and having chamfered entrance surfaces 134.

The female structure 121 also includes a generally rectangular center plate 135 provided with corner holes (not shown) therethrough and having an elongated aperture 136 formed therethrough (FIGS. 14, 16 and 19 ) from an upper peripheral edge thereof, and having laterally spaced-apart parallel side edges 137 interconnected at the lower ends thereof by an arcuate inner end 138.

In assembly, the center plate 135 is disposed between the base plate 122 and the cover plate 130, the three plates being stacked in congruent relationship so that the corner holes thereof are respectively aligned for respectively receiving rivets 139 to secure the parts of the female structure 121 together. When thus assembled, the slot 132 is aligned with the aperture 136 (FIG. 14), with the U-shaped end 133 substantially concentric with the arcuate end 138. However, the slot 132 and the U-shaped end 133 are, respectively, smaller than the aperture 136 and the arcuate end 138, so that the peripheral edges of the former extend inwardly beyond the edges of the latter for cooperation therewith and with the base plate 122 to define a generally U-shaped receptacle 140 (FIGS. 14 and 18) having an elongated entrance 141 which opens at the top edge of the female structure 121. It will be appreciated that the rivets 139 may also serve to secure the female structure 121 to the inner leg 118 of the hanger loop 116.

Referring in particular to FIG. 16, it can be seen that when the parts are thus assembled, the retaining prong 124 and the bias finger 125 project into the receptacle 140 and have lengths and inclinations such that they terminate substantially at the inner surface of the cover plate 130. Preferably, the base plate 122 is formed of a suitable metal and has a thickness such that the retaining prong 124 and the bias finger 125 are flexible and resilient, being biased to their normal rest positions illustrated in FIG. 16 interfering with passage through the receptacle entrance 141, and being resiliently deflectable from those positions back toward the plane of the base plate 122.

The male structure 150 includes a rectangular plate 151 (FIGS. 15, 18 and 20), which may be substantially congruent with the female structure 121 and which may be secured by rivets 153 or other suitable fasteners to the rear wall 111 of the device 110. The central portion of the plate 151 may be raised to define a rectangular channel which extends between the top and bottom edges of the plate 151 substantially parallel to the side edges thereof, in the manner illustrated in the aforementioned U.S. Pat. No. 5,054,170. A stud 155 is fixed to the plate 151 centrally thereof and projects rearwardly therefrom. The stud 155 may include a cylindrical shank 156 provided at its distal end with an enlarged, disk-like, part-circular head 157 which is coaxial with the shank 156 and is truncated along a cord thereof to define a straight side edge 158.

Referring now in particular to FIGS. 16-20, the operation of the connecting apparatus 120 will be described. It will be appreciated that the female structure 121 is mounted on the hanger loop 116 so that, in use, the receptacle 140 will open upwardly when the hanger loop 116 is mounted on the belt 115 of a user. Thus, the female structure 121 defines an open-top or top-loading receptacle 140. In use, the device 110 is positioned with the male structure 150 facing the female structure 121 and substantially parallel thereto, as indicated in FIG. 12. The head 157 of the stud 155 is then inserted into the open entrance 141 of the receptacle 140 and slid downwardly in the direction of the arrow FIG. 12, with the shank 156 extending through the slot 132 in the cover plate 130.

The head 157 has a diameter slightly greater than the width of the slot 132 in the cover plate 130 and slightly less than the width of the receptacle 140, which is defined by the diameter of the arcuate end 138 of the center plate aperture 136, i.e., the distance between the side edges 137. The straight edge 158 of the head 157 is so dimensioned and positioned that, when it is disposed facing the retaining prong 124, the head 157 will clear the retaining prong 124 in its locking position as the head 157 moves through the receptacle 140. In any other rotational orientation of the device 110 about the stud shank 156, the retaining prong 124 in its normal locking position will interfere with the passage of the head 157 into the receptacle 140. However, the flexible, resilient nature of the retaining prong 124 permits it to be cammed to a release position by the head 157 to permit passage of the head 157 into the receptacle 140. Accordingly, it is a significant aspect of the invention, that the male structure 150 may be engaged with the female structure 121 in any rotational orientation of the device 110, in a manner similar to that indicated in FIG. 3.

Once the head 157 is seated in the inner end of the receptacle 140, the retaining prong 124 will spring back to its normal locking position, as indicated in FIGS. 16-18 and 20. Thus, the head 157 is trapped in the receptacle 140 since it is too large to pass through the slot 132 in the cover plate 130.

It will be appreciated that as the head 157 moves into the receptacle 140 through the entrance 141 it also engages the bias finger 125, but the resilient nature of the bias finger 125 permits it to be cammed out of the way to permit passage of the head 157. The dimensions of the bias finger are such, that when the head 157 is seated in the lower end of the receptacle 140, the distal end portion 127 of the bias finger 125 remains in engagement with the outer surface of the head 157, as can best be seen in FIG. 18. Thus, the bias finger 125 resiliently biases the head 157 into engagement with the inner surface of the cover plate 130, thereby frictionally inhibiting rotation of the male structure 150 about the axis of the shank 156 while the head 157 is seated in the receptacle 140. This will tend to prevent casual or accidental rotation of the device 110, but will permit intentional rotation of the device 110 to its proper use orientation illustrated in FIG. 13, which is preferably with the straight side edge 158 of the head 157 facing away from the retaining prong 124. It can be seen that, in this orientation, the retaining prong 124 prevents removal of the head 157 from the receptacle 140.

Indeed, removal is prevented in any rotational orientation of the device 110 except the one wherein the straight side edge 158 of the head 157 faces the retaining prong 124, as is illustrated in FIGS. 19 and 20. In this single orientation, the retaining prong 124 will not interfere with passage of the head 157 from the receptacle 140 so that the male structure 150 can be disconnected from the female structure 121 by moving it upwardly out of the receptacle 140. It will be appreciated that the bias of the bias finger 125 is such as to permit rotation of the device 110 to the orientation illustrated in FIGS. 19 and 20 to accommodate removal of the head 157 from the receptacle 140.

In a constructional model of the invention, the male structure 150 and the female structure 121 are formed of metal, but it will be appreciated that they could be formed of other suitable materials. Also, while the female structure 121 is illustrated of being of multi-part construction, other constructions would be possible to achieve the same results.

From the foregoing, it can be seen that there has been provided an improved connecting apparatus which is of simple and economical construction, and which provides ready engagement of two parts in multiple orientations while permitting disengagement in only a single orientation, and while inhibiting accidental rotation of the parts and effectively preventing accidental disengagement of the parts. 

I claim:
 1. Apparatus for detachably interconnecting two objects including, in combination: a female structure adapted to be secured to one of the objects and defining a receptacle and an entrance leading into the receptacle, a male structure adapted to be secured to the other object and including a shank with an axis and an enlarged head on said shank adapted for movement into and out of said receptacle through said entrance and rotatable about said axis while in said receptacle, and a flexible resilient retaining member integral with said female structure and laterally offset to one side of the entrance in a first direction and normally disposed in a locking position projecting into said entrance in a second direction substantially normal to said first direction for interference with passage of said head therethrough, said retaining member being yieldably movable to a release position accommodating passage of said head through said entrance, said head being laterally truncated at one side of said axis so that while passing through said entrance in one rotational orientation thereof said head will clear said retaining member in its locking position and in all other rotational orientations it will engage said retaining member in its locking position, said retaining member being yieldably movable to its release position in response to engagement by said head during passage thereof into said receptacle and receptacle and being non-yieldably engageable by said head in said receptacle to prevent removal thereof from said receptacle in all but said one rotational orientation.
 2. The apparatus of claim 1, wherein said retaining member is unitary with said female structure.
 3. The apparatus of claim 2, wherein said retaining member comprises a prong projecting from said female structure.
 4. The apparatus of claim 1, wherein said female structure includes three interconnected stacked plates including an inner plate connected to the associated object and an outer plate and a middle plate, said outer plate having a slot formed therethrough at the periphery thereof and extending toward the center thereof, said middle plate having an aperture therethrough larger than said notch and overlapping the entire area of said notch for cooperation with said inner and outer plates to define said receptacle.
 5. The apparatus of claim 4, wherein said retaining member is unitary with said inner plate.
 6. The apparatus of claim 5, wherein said retaining member comprises a prong projecting from said inner plate into said receptacle toward said outer plate.
 7. Apparatus for detachably interconnecting two objects including, in combination: a female structure adapted to be secured to one of the objects and defining a receptacle and an entrance leading into the receptacle, a male structure adapted to be secured to the other object and including a shank with an axis and an enlarged head on said shank adapted for movement into and out of said receptacle through said entrance and rotatable about said axis while in said receptacle, a flexible resilient retaining member integral with said female structure and normally disposed in a locking position projecting into said entrance for interference with passage of said head therethrough, said retaining member being yieldably movable to a release position accommodating passage of said head through said entrance, said head being non-symmetrical with respect to said axis so that while passing through said entrance in one rotational orientation thereof said head will clear said retaining member in its locking position and in all other rotational orientations it will engage said retaining member in its locking position, said retaining member being yieldably movable to its release position in response to engagement by said head during passage thereof into said receptacle and being non-yieldably engageable by said head in said receptacle to prevent removal thereof from said receptacle in all but said one rotational orientation, and bias means resiliently engageable with said head in said receptacle for frictionally inhibiting rotation of said head about said axis.
 8. The apparatus of claim 7, wherein said bias means includes a flexible resilient bias member integral with said female structure.
 9. The apparatus of claim 8, wherein said bias member is unitary with said female structure.
 10. The apparatus of claim 9, wherein said bias member comprises a finger projecting from said female structure into said receptacle.
 11. The apparatus of claim 10, wherein said retaining member comprises a prong projecting from said female structure into said receptacle.
 12. The apparatus of claim 7, wherein said female structure includes three interconnected stacked plates including an inner plate connected to the associated object and an outer plate and a middle plate.
 13. The apparatus of claim 12, wherein said bias means includes a resilient bias member integral with said inner plate and projecting therefrom.
 14. The apparatus of claim 13, wherein said bias member comprises a resilient tab unitary with said inner plate and projecting therefrom into said receptacle and toward said outer plate.
 15. The apparatus of claim 13, wherein said retaining member comprises a prong unitary with said inner plate and projecting therefrom into said receptacle and toward said outer plate.
 16. The apparatus of claim 13, wherein said bias member includes a first portion unitary with said inner plate and inclined therefrom toward said outer plate, and a second distal end portion substantially parallel to said inner plate. 